Menu

NGC 1820 — Open Cluster in Dorado

Open Cluster Fair (31/100)
Magnitude 9.0m OpenCluster Dorado (Dor) Visible
Star Map
+ List + Plan Star Hop

Observe

1Properties

Magnitude 9.0
Angular Size 7.0′ × 5.4′
Position Angle 20°
Cl, pL, Ri, C, iF

Position & Identifiers

RA 05h 04m 01.7s
Dec -67° 15' 57.2"
Constellation Dorado (Dor)
Catalog NGC 1820

2How easy to spot?

Sign in and configure your equipment and default location to see a personalized row.
Telescope Bortle 3 Bortle 4 Bortle 5
80mm refr. Easy Easy Medium+
150mm Newt. Easy Easy Easy
C8 203mm Easy Easy Easy
Easy Medium Hard Very hard Impossible

Bortle 3 = rural · 4 = outer suburbs · 5 = suburbs

Easy on Seestar S50

3Visibility

Set a location in User Settings to see visibility data.

Best season Nov – Jan (peak: Dec)

4 Eyepiece View

Log in to set your own equipment
125x TFOV: 0.4° Lim. mag: 13.6
N E

NGC 1820 · 7.0′ diameter

5 Best Magnification

Explore

6 Classification Decoder

Nearby in the Sky

Other targets within a few degrees — pan your scope a little and keep exploring.

Visibility scores assume a 150 mm Newton at Bortle 4.

NGC 1844
Hard+
Open cluster
Open Cluster mag 12.08 0.3° Dorado
NGC 1846
Medium+
Compact globular cluster
Globular Cluster mag 11.0 0.4° Dorado
NGC 1774
Easy
Open cluster
Open Cluster mag 10.0 0.6° Dorado
NGC 1818
Easy
Open cluster
Open Cluster mag 9.8 0.8° Dorado
NGC 1810
Hard+
Open cluster
Open Cluster mag 11.90 0.9° Dorado
NGC 1763
Medium+
Emission nebula — try an OIII filter
Emission Nebula mag 9.40 1.1° Dorado
NGC 1714
Hard+
Diffuse nebula
Diffuse Nebula mag 11.61 1.2° Dorado
Show on Map

Explore Nightbase

Related knowledge, tools, and stories — no observation planning required.

The Life of Stars
From birth in a nebula to spectacular death — how stars are born, shine, swell, and die, and how to read the clues in their starlight.
Article
Dorado
Mythology, bright stars, and deep-sky highlights.
Constellation
Jupiter
The Great Red Spot, cloud belts, and the Galilean moons.
Deep dive
}